Unit 1 Flashcards by Ross Taylor

What is electricity

movement of e-

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What is ampere

strength of the current (charge over time)

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What is electric field

force exerted by an electric charge

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What is electrical potential energy

the energy needed to affect other electric charges

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What is impedance

opposition to the magnitude and phase of a current

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What is resistance

opposition to the magnitude of a current (similar to friction)

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What is capacitance

ratio of the change in an electric charge

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What is DC

electric current that is unchanging; resistance and impedance are the same

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What is AC

electric current that periodically reverses direction; resistance and impedance are not the same

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What is magnetic field

vector field created by electric charges in relative motion

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What is electrodynamics

the interaction s between electric charges and currents

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What is electromagnet

magnetic field created by an electrical curren

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What is magnetic domain

region of a magnetic field that is in a uniform direction

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What is magnetic susceptibility

extent to which a material is affected by a magnet

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What is Tesla

unit of measure for magnetic force (1T=10,000G)

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What is Gauss

unit of measure for magnetic force (earth’s magnetic force = 0.5G)

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What is the phase

waveform of going through a complete cycle

What is electromagnetic induction

production of a current due to the motion of a magnetic field

What is electromagnetic radiation

EM waves interactions w/ matter

How do like and unlike electric charges interact

likes repel; opposites attract

how does distance affect the strength of electrostatic charges

inverse square law

Ohm’s Law

I=V/R

I - current; V - voltage; R - resistance

Describe an insulator

resists the effects of a current

Describe a conductor

easily carries a current

Describe a semiconductor

conductivity between an insulator and a conductor

Describe a superconductor

conductor that never loses a current

Ferromagnetic

highly susceptible to magnetic force

paramagnetic

partially susceptible to magnetic force

Diamagnetic

not affected by magnetic force

Temporary magnet

magnetization is applied or removed when exposed to a magnetic force

Permanent magnet

magnetization isn't affected by a magnetic force

How do like and unlike magnetic poles interact

opposites attract; likes repel

how does distance affect magnetic field strength

inverse square law

Faraday's Law (of electromagnetic induction)

V = -dB/dt | V - Electromotive force; dB - change in the magnetic field; dt - change in time

types of impedance

Resistors - release of energy through heat Capacitor (plates) - energy is stored in an electric field Inductor (coils) - energy is stored in a magnetic field

physical causes of electromagnetic radiation

radio waves, light, heat

What are the orientations of the magnetic domains in a magnet?

they oscillate, 90 degrees out of phase, perpendicular to each other

How is the magnetic field affected if a current is looped?

amplifies the magnetic field

What is the orientation of an induced magnetic field to the current

counter clockwise (right hand rule)

What do the waveforms look like when they are in phase?

overlapping sine waves

What do the waveforms look like when they are 90 degrees out of phase?

sine and cosine waves

What do the waveforms look like when they are 180 degrees out of phase?

sine and -sine waves